resolve a variable in GitLab CI's variable clause

Question

I have a scenarios where I need to push a feature branch's commit to an environment for testing. There are few environments and a developer has a choice to push to any ENV based on the commit message.

  rules:
    - if: $CI_COMMIT_REF_NAME =~ /^feature\/CONN-*/ && $CI_COMMIT_MESSAGE =~ /^*Enterprise_1.*$/
      variables:
        Name_Tag: "Enterprise_1"
      when: always
    - if: $CI_COMMIT_REF_NAME =~ /^feature\/CONN-*/ && $CI_COMMIT_MESSAGE =~ /^*Enterprise_2.*$/
      variables:
        Name_Tag: "Enterprise_2"
      when: always
    - if: $CI_COMMIT_REF_NAME =~ /^feature\/CONN-*/ && $CI_COMMIT_MESSAGE =~ /^*Enterprise_3.*$/
      variables:
        Name_Tag: "Enterprise_3"

So if a commit message contains a string with "Enterprise_2", then deployment will go to "Enterprise_2" environment. likewise depending on Enterprise_X, an Enterprise_X env will be picked. I searched if capture groups are supported on gitlab, but couldn't find any documentation.

Also i tried the below:-

rules:
  - if: $CI_COMMIT_REF_NAME =~ /^feature\/CONN-*/ && $CI_COMMIT_MESSAGE =~ /^*Enterprise_[1-9].*$/
      variables:
        Name_Tag: 'if [[ $CI_COMMIT_MESSAGE =~ ^.*(Enterprise_[1-9])(.*)$ ]]; then echo "${BASH_REMATCH[1]}"; fi'

But this sets Name_Tag variable to literal "if [[ $CI_COMMIT_MESSAGE =~ ^.(Enterprise_[1-9])(.)$ ]]; then echo "${BASH_REMATCH[1]}"; fi".

could you please advise on a solution.

Answer 1

rules are not really meant to be used to set variables. As the reference states:

Use rules to include or exclude jobs in pipelines.

---

For this situation before_script step should be used:

job:
  rules:
    - if: $CI_COMMIT_REF_NAME =~ /^feature\/CONN-*/ && $CI_COMMIT_MESSAGE =~ /^*Enterprise_[1-9].*$/
  before_script:
    - >
      if [[ $CI_COMMIT_MESSAGE =~ "^.*(Enterprise_[1-9]).*$" ]]; then
        NAME_TAG=$(BASH_REMATCH[1]);
      fi
  script:
    - echo $NAME_TAG

First, we are going to have only one rule, for branches in feature/CONN-x format, and whose commit message has Enterprise_x string. Since we are sure that commit message has desired string we can extract it in before_script. If the regex is matched, set NAME_TAG to the value of the captured group.

---

If for any reason BASH_REMATCH isn't working for you, like it (still) isn't working for me, you can try sed. Match group you need, and substitute everything before and after the group:

job:
  before_script:
    - NAME_TAG=$(echo $CI_COMMIT_MESSAGE | sed -r "s/^.*(Enterprise_[1-9]).*$/\1/")